Revert "[QNN EP] Fix error messages being logged as VERBOSE instead o… (#27650)
### Description
Revert QNN SDK logging verbosity changes introduced in
https://github.com/microsoft/onnxruntime/pull/24931.
This reverts commit ec4f6bfa1f68ec7aee1608fb5ee3f7f0917330fe.
### Motivation and Context
Loggin used to fail on QNN backend destruction (when releasing QNN
context handles) with segmentation faults (even with empty user logging
functions), hence reverting the changes.
Co-authored-by: Tianlei Wu <tlwu@microsoft.com>